/Engine/Plugins/Experimental/PCG/Source/PCG/Public/Metadata/PCGMetadata.h
Creates missing attributes from another metadata if they are not currently present - note that this does not copy values.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="PCG|Metadata") void AddAttributesFiltered ( const [UPCGMetadata](API\Plugins\PCG\Metadata\UPCGMetadata) * InOther, const [TSet](API\Runtime\Core\Containers\TSet)< [FName](API\Runtime\Core\UObject\FName) > & InFilteredAttributes, [EPCGMetadataFilterMode](API\Plugins\PCG\Metadata\EPCGMetadataFilterMode) InFilterMode )